There are 4 great apes: gorillas, orangutans, chimpanzees, and bonobos. Gorillas, chimpanzees, and bonobos live in large social groups in Africa. Orangutans are found only on the islands of Borneo and Sumatra and spend much of their time alone. Chimpanzees share more genetic material with humans—about 99%—than they do with gorillas. Human beings are considered the 5th “great ape.”